The Pricey Oil Change

RAY: Some years ago, my wife and I went on a summer vacation, and we took our two kids along. We tried to ditch them, but they found out at the last minute.

We flew to an undisclosed location. It's undisclosed because if I disclose it, you'd know the answer to the puzzler. When we got there, we rented a car and drove around. After a day or so of driving, we found that we needed gasoline, so I pulled into a gas station. As I pulled in, on the face of the building I saw a huge sign that said, "Oil Change Special: 99.50."

The sign was written in English, with the dollar sign. Now, normally, an oil change might cost 19.95.